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                # 4.C語言do-while語句的用法 do-while語句的一般形式為: ? ? do ? ? ? ? 語句 ? ? while(表達式); 這個循環與while循環的不同在于:它先執行循環中的語句,然后再判斷表達式是否為真,如果為真則繼續循環;如果為假,則終止循環。因此,do-while循環至少要執行一次循環語句。其執行過程可用下圖表示。 ![](http://www.lvtao.net/content/uploadfile/201404/ad5c6176386569d3ea6af5937236398c20140421041934.gif) 【例6-5】用do-while語句計算從1加到100的值 ~~~ main(){ int i,sum=0; i=1; do{ sum=sum+i; i++; } while(i<=100); printf("%d\n",sum); } ~~~ 同樣當有許多語句參加循環時, 要用"{"和"}"把它們括起來。 【例6-6】while和do-while循環比較。 1) while循環: ~~~ main(){ int sum=0,i; scanf("%d",&i); while(i<=10){ sum=sum+i; i++; } printf("sum=%d",sum); } ~~~ 2) do-while循環: ~~~ main(){ int sum=0,i; scanf("%d",&i); do{ sum=sum+i; i++; } while(i<=10); printf("sum=%d",sum); } ~~~
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